Originally Posted by MTL_4runner

It wasn't from me flushing, it was a dealer in AZ that refilled my vehicle with tap water (don't get me started) and the water out there is horribly hard. If you live in a place where the water isn't as hard, it's probably not that bad to just mix with tap water. All that being said I still don't know why people would even bother because they sell the premixed pink which has none of those problems, it lasts longer and by the bottle it's also cheaper. It doesn't make sense at this point to be doing that anymore......just use the super long life pink and refill your system carefree.